This video from England says about itself:
14 April 2014
Mysterious street artist Banksy appears to have unveiled his latest creation – targeting the issue of government surveillance. The artwork shows three 1950s-style agents, wearing brown trench coats and trilby hats, using devices to tap into conversations at a telephone box. It appeared overnight on a street in Cheltenham, Gloucestershire, just a few miles from GCHQ, where the UK’s surveillance network is based.